@iamniks
There is nil bug as far as I am aware.
It is not absolutely clear from your clip, but possibly you are not clicking in the correct sequence?
The + [Plus] and - [Minus] are both showing up.
In the following a Nut is being Chamfered. Removal of a Thread from a Body follows a similar process:
https://drive.google.com/file/d/1B6njVA78JXN-v1P9jD6NI3eCFmk2CcQM/view?usp=sharing